The M is missing.

Cyanide is used for an awful lot of things industrially including gold extraction, electroplating, metal hardening, polymer and plastics, as well as pest control and in the US we add acid to it to kill people in gas chambers.

Its not a useful mass terror weapon and efforts to use it as such in WWI were extremely disappointing.

Nice try, but you can generally get this sort of thing at the local chemical supply company.